CrossCore System Suspension Trainer Fitness Equipment + Pro Kit Pro kit includes 2 specialized club straps and independent D-ring allowing for easier installation and removal of the CrossCore&reg; System Pin Engagement System&trade; includes easy-to-reach adjustment knob with colored markings showing locked and unlocked positions Lightweight, durable aluminum alloy commercial-grade pulley housing Pulley wheel includes high-quality sealed bearings for long-lasting, smooth rotation Rope Adjuster Device&trade; (RAD&trade;) lets you easily adjust handle placement and rope lengths